a18v(l)o replaces: 09.09 english series 10 - jo hydraulics · responsible contact person at...

Instruction manual

RE 92270-01-B/01.11Replaces: 09.09English

Axial Piston Variable Pump A18V(L)OSeries 10

The data specified above only serve to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. The information given does not release the user from the obligation of own judgment and verification. It must be remembered that our products are subject to a natural process of wear and aging.

© This document, as well as the data, specifications and other information set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be reproduced or given to third parties without its consent.

The cover shows an example application. The product delivered may differ from the image on the cover.

The original operating instructions were created in the German language.

RE 92270-01-B/01.11 | A18V(L)O Series 10 Bosch Rexroth AG 3/52

Contents

Contents1 About this manual ..........................................................................................4

1.1 Related documents ...................................................................................41.2 Abbreviations used ...................................................................................5

2 General safety instructions ...........................................................................62.1 Intended use .............................................................................................62.2 Improper use .............................................................................................62.3 Personnel qualifications ............................................................................72.4 Safety instructions in this document .........................................................72.5 Adhere to the following instructions ..........................................................82.6 Operator's obligations ...............................................................................9

3 Delivery contents ..........................................................................................104 Product description ......................................................................................11

4.1 Performance description .........................................................................114.2 Device description...................................................................................114.3 Product identification...............................................................................13

5 Transport and storage ..................................................................................145.1 Transporting the axial piston unit ............................................................145.2 Storing the axial piston unit .....................................................................15

6 Installation .....................................................................................................176.1 Unpacking ...............................................................................................176.2 Installation conditions..............................................................................176.3 Installation position .................................................................................196.4 Installing the axial piston unit ..................................................................21

7 Commissioning .............................................................................................317.1 First commissioning ................................................................................327.2 Recommissioning after standstill ............................................................357.3 Runningin phase ....................................................................................35

8 Operation .......................................................................................................369 Maintenance and repair ................................................................................37

9.1 Cleaning and care ...................................................................................379.2 Inspection................................................................................................379.3 Maintenance ...........................................................................................389.4 Repair .....................................................................................................399.5 Spare parts .............................................................................................39

10 Decommissioning .........................................................................................4011 Removal and replacement ...........................................................................40

11.1 Required tools .........................................................................................4011.2 Preparing for removal .............................................................................4011.3 Removing the axial piston unit ................................................................4011.4 Preparing the components for storage or further use .............................41

12 Disposal .........................................................................................................4212.1 Environmental protection ........................................................................42

13 Extension and conversion ...........................................................................4214 Troubleshooting ...........................................................................................43

14.1 How to proceed for troubleshooting ........................................................4314.2 Malfunction table .....................................................................................44

15 Technical data ...............................................................................................4616 Appendix .......................................................................................................46

16.1 Address directory ...................................................................................4617 Alphabetical index ........................................................................................47

4/52 Bosch Rexroth AG A18V(L)O Series 10 | RE 92270-01-B/01.11

About this manual

About this manual1 This manual contains important information on the safe and appropriate installation, transport, commissioning, maintenance, removal and simple troubleshooting of the axial piston variable pump A18V(L)O Series 10.

Read these instructions completely, especially chapter "2 General safety finstructions", before working with the axial piston variable pump A18V(L)O.

1.1 Related documentsThe axial piston variable pump A18V(L)O is a system component. Also observe the manuals for the other system components.Further information on the axial piston variable pump A18V(L)O, its installation and operation can be found in the Rexroth documents listed in the following table.

Related documentsTable 1: Related documents ContentsOrder confirmation Contains the preset technical data of your

axial piston variable pump A18V(L)O.Installation drawing Contains the outer dimension, all ports and the hydraulic

circuit diagram for your axial piston variable pump A18V(L)O. The installation drawing can be requested from your responsible contact person at Rexroth.

Data sheet RE 92270 Contains the permissible technical data for the axial piston variable pump A18VO Series 10.

Data sheet RE 92280 Contains the permissible technical data for the axial piston variable pump A18VLO Series 10.

Data sheet RE 90220 Describes the requirements on a mineraloil based hydraulic fluid and related hydrocarbons for the operation with Rexroth hydraulic components, and assists you in selecting a hydraulic fluid for your system.

Data sheet RE 90221 Describes the requirements on an environmentally acceptable hydraulic fluid for operation with Rexroth hydraulic components and assists you in selecting a hydraulic fluid for your system.

Data sheet RE 90312 Contains additional information about storing and preserving axial piston units.

Also observe the generally applicable, legal or otherwise binding regulations of the European and national legislation and the rules for the prevention of accidents and for environmental protection applicable in your country.


About this manual

Abbreviations used1.2 As umbrella term for "axial piston variable pump A18V(L)O", the designation "axial piston unit" will be used in the following.Table 2: AbbreviationsAbbreviation MeaningA18VO Axial piston variable pump, open circuits

A18VLO Axial piston variable pump, open circuit, with increased service life of bearings

DIN Deutsche Industrie Norm (German Institute for Standardization)

DRS Pressure controller with load sensing

DRS.E Pressure controller with load sensing and external pump measurement pressure port

EP Proportional control, electric

ISO International Organization for Standardization

RE Rexroth document in the English language

VDI 2230 Directive for the systematic calculation of high duty bolted joints and joints with one cylindrical bolt from the VDI (Verein Deutscher Ingenieure Association of German Engineers)


General safety instructions

2 General safety instructionsThe axial piston unit has been manufactured according to the generally accepted rules of current technology. There is, however, still a danger of personal injury or damage to equipment if the following general safety instructions and the warnings before the steps contained in this manual are not complied with.

Read this manual completely and thoroughly before starting work with the faxial piston unit.Keep this manual in a location where they are accessible to all users at all ftimes.Always include the instruction manual when you pass the axial piston unit on fto third parties.

Intended 2.1 useAxial piston units are hydraulic components, meaning that in their application they are classified neither as complete nor as incomplete machines in the sense of the EU machine directive 2006/42/EC. A component is exclusively intended to form an incomplete or a complete machine together with other components. The component may only be commissioned after it has been installed in the machine/system for which it is intended.The product is intended for the following use:The axial piston unit is only approved as a pump for hydrostatic drives in open circuits.

Observe the technical data, f application and operating conditions and performance limits as specified in data sheet RE 92270 and RE 92280 and in the order confirmation. Information about approved hydraulic fluids can be found in data sheet RE 92270 and RE 92280.

The axial piston unit is only intended for professional use and not for private use.Intended use includes having read and understood the complete documentation, especially the chapter "2 General safety instructions".

Improper 2.2 useAny use other than that described as intended use shall be considered as improper and is therefore impermissible.If unsuitable products are installed or used in applications that are of relevance to safety, unexpected operating conditions may occur in the application which could result in injury to persons or property damage.For this reason, products should only be used in safetyrelevant applications if this usage is expressly specified and approved in the documents related to the product. For example, in exprotection areas or in safetyrelated parts of a control system (functional safety).Bosch Rexroth AG shall accept no liability whatsoever for damage resulting from improper use. The user shall bear all risks arising from improper use.



Similarly, the following predictable fault usages are also considered to be not as intended:

Using the axial piston unit in explosive environments • unless the component or system has been certified as compliant with the ATEX directive 94/9/EGUse of nonapproved fluids as stated on data sheet RE 92270 and RE 92280, •e.g. water or polyurethane componentsModification of factory settings by nonauthorized persons •Use of add/on parts (e.g. mountable filter, control unit, valves) that are not •specified Rexroth componentsUsing the axial piston unit under water at a depth of more than 10 meters •without necessary additional measures, e.g. pressure equalizationUsing the axial piston unit in aircraft or space craft •Using the axial piston unit when the exterior pressure is greater than the interior •pressure (case pressure)Using the axial piston unit in an aggressive atmosphere •Using outside the operating parameters approved in the data sheet (unless •special approval has been granted)

2.3 Personnel qualificationsInstallation, commissioning and operation, removal, care and maintenance require basic mechanical, hydraulic and electrical knowledge, as well as knowledge of the appropriate technical terms. For transporting and handling the product, additional knowledge is necessary with regard to working with a lifting device and the corresponding attachment equipment. In order to ensure operating safety, these activities may therefore only be carried out by qualified personnel or an instructed person under the direction and supervision of qualified personnel.Qualified personnel are those who can recognize possible hazards and institute the appropriate safety measures due to their professional training, knowledge, and experience, as well as their understanding of the relevant conditions pertaining to the work to be done. Qualified personnel must observe the rules relevant to the subject area.

2.4 Safety instructions in this documentIn this manual, there are safety instructions before the steps whenever there is a danger of personal injury or damage to equipment. The measures described to avoid these hazards must be observed.Safety instructions are set out as follows:

Type of danger!Consequences

Precautions f

Safety sign • (warning triangle): draws attention to the dangerSignal word: • identifies the degree of the dangerType of danger: • identifies the type or source of the dangerConsequences: • describes what occurs if the safety instructions are not complied withPrecautions: • states how the danger can be avoided.

SIGNAL wORD!



The signal words have the following meaning:

Signal word ApplicationDANGER! Indicates an imminently hazardous situation which, if not

avoided, will certainly result in death or serious injury.

wARNING! Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAuTION! Indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury or damage to equipment.

If this information is disregarded, the operating procedure may be impaired.

Adhere to the following instructions2.5 • Observe the regulations for accident prevention and environmental protection

for the country where the product is used and at the workplace.Only use Rexroth axial piston units in good technical order and condition. •

Inspect the product for obvious defects. –Do not modify or convert the axial piston unit. •Use the product only within the performance range provided in the technical •data.Persons who install, commission, operate, remove or maintain Rexroth •products must not consume any alcohol, drugs or pharmaceuticals that may affect their ability to respond.The warranty applies only to the delivered configuration • .The warranty is rendered void if the product is incorrectly installed, •commissioned or operated, and also if not used as intended and/or handled improperly.Do not expose the product to any mechanical loads under any circumstances. •Never use the product as a handle or step. Do not place/lay any objects on it.The noise emission of axial piston units depends on speed, operating pressure •and installation conditions. The sound pressure level may rise above 70 dBA during normal application conditions. This can cause hearing damage.

Always wear hearing protection while working in the vicinity of the operating –axial piston unit.

The axial piston unit • may heat up so much during operation that you can burn yourself on it.

Allow the axial piston unit to cool down sufficiently before touching it. –Wear heatresistant protective clothing, e.g. gloves. –

Hydraulic fluid is easily flammable. •Keep open flames and ignition sources away from the axial piston unit. –

Contact with • hydraulic fluids may cause health damage.When working with – hydraulic fluids, strictly observe the safety instructions provided by the hydraulic fluids manufacturer.

General instructions



• Make sure that the lifting device has adequate lifting capacity. The weight can be found in chapter "5 Transport and storage".

• Before installation, make sure that all fluids have been removed from the axial piston unit to prevent mixing with the hydraulic fluid used in the system.Always set up the relevant part of the system so that it is depressurized and •free of electrical voltage before you install the product or when connecting and disconnecting plugs. Protect the system against being energized.Lay cables and lines so that they cannot be damaged and no one can trip over •them.Before commissioning, make certain that all hydraulic connections are tight and •that all of the connection seals and plugs are installed correctly to ensure that they are leakproof and fluids and contaminants are prevented from penetrating the product.When installing, provide for utmost cleanliness in order to prevent contami •nants, such as welding beads or metal cuttings, from getting into the hydraulic lines and causing product wear or malfunctions.

• Ensure that all electrical and hydraulic connections and ports are occupied or plugged. Only commission a completely installed product.

• Plug all openings with the appropriate protective equipment in order to prevent detergents from penetrating the system.Never use solvents or aggressive detergents. Use only water and, if necessary, •a mild detergent to clean the axial piston unit.Do not point the power washer at sensitive components, e.g. shaft seal ring, •electrical connections and electrical components.

• Perform the prescribed maintenance work at the intervals specified in the instruction manual (see chapter "9.3 Maintenance").Make certain that no lines, connections or components are disconnected •as long as the system is under pressure. Protect the system against being energized.

• Dispose of the product and the hydraulic fluid in accordance with the currently applicable national regulations in your country.

2.6 Operator's obligationsThe operator of the Rexroth axial piston unit must provide personnel training on a regular basis regarding the following subjects:

Observation and use of the instruction manual and the legal regulations •Intended use and operation of the axial piston unit •Observation of the instructions from the factory security offices and of the work •instructions from the operator

Rexroth offers training support for special fields. You can find an overview of the training contents on the Internet at: http://www.boschrexroth.de/didactic.

During transport

During installation

During commissioning

During cleaning

During maintenance and repair

During disposal


Delivery contents

3 Delivery contents

1

1

Axial piston unit A18VOFig. 1:

1

1

1

Axial piston unit A18VLOFig. 2:

Included in the delivery contents are:

Axial piston unit • as per order confirmation

The following parts are also installed on delivery:

Plastic plugs / threaded plugs ( • 1)Check the delivery contents for completeness and transport damages. f


Product description

4 Product description

4.1 Performance descriptionThe axial piston variable pump generates, controls and regulates a hydraulic fluid flow. It is designed for use in commercial vehicles.Refer to the data sheet and order confirmation for the technical data, operating conditions and operating limits of the axial piston unit.

4.2 Device descriptionThe A18V(L)O is a variable pump with axial tapered piston rotary group in bentaxis design for hydrostatic drives in open circuits. Longlife bearings are employed on the A18VLO. Flow is proportional to drive speed and displacement. The flow can be steplessly changed by controlling the bent axis. For axial piston units with bentaxis design, the pistons (3) are arranged at an angle to the drive shaft (1).In an open circuit, the hydraulic fluid flows from the reservoir to the hydraulic pump from where it is fed via a directional valve to the consumer, e.g. cylinder. From the consumer, the hydraulic fluid flows back to the reservoir via the directional valve.

4.2.1 Assembly of the axial piston unit

1

34

5

6

7

8

1

34

5

6

7

8

22

Assembly of A18VO (left-hand illustration) and A18VLO (right-hand illustration)Fig. 3:

1 Drive shaft2 Case3 Piston

4 Cylinder5 Control valve6 Lens plate

7 Port plate8 Stroke piston

Open circuit


Product description

Functional description4.2.2 Torque and a rotational speed are applied to the drive shaft (1) by an engine. The cylinder (4) is picked up and turned by the drive shaft and the pistons (3). The cylinder then glides over the lens plate (6), in which two kidneyshaped control slots have been incorporated. With every revolution, the pistons execute a stroke in the cylinder bores, the size of which depends on the swivel angle (pitch) of the bent axis rotary group. During a rotation, each piston moves over the bottom and top dead centers back to its initial position. Here, hydraulic fluid is fed into and out through two control slots in the lens plate according to the displacement. On the suction side, hydraulic fluid flows into the enlarging piston chamber. At the same time, on the highpressure side the hydraulic fluid is pushed out of the cylinder chamber into the hydraulic system by the pistons.The swivel angle of the bent axis rotary group can be steplessly varied. Adjusting the swivel angle of the bent axis rotary group controls the piston stroke and, therefore, the displacement. The swivel angle is changed hydraulically via the stroke piston (8). Here, the cylinder is swiveled including the pistons and lens plate. The lens plate is mounted for easy motion in a guideway.Increasing the swivel angle increases the displacement; reducing the angle results in a corresponding reduction in displacement. Displacement is zero when there is no angle of tilt.DRS – when depressurized, the pump is swiveled to its initial position Vg max by an adjustment spring.EP2 – initial position when depressurized at Vg min. In order to be able to build up pressure, a residual of approx. 10 % of Vg max is set permanently.EP6 – initial position when depressurized at Vg min.

Various control devices are available depending on requirements. Information about this can be found in data sheet RE 92270 and RE 92280.

The following warning concerns all axial piston units with EP controller

The spring return in the controller is not a safety device.The spool valve in the controller can get stuck in an undefined position by internal contamination (contaminated hydraulic fluid, abrasion or residual contamination from system components). As a result, the axial piston unit flow will no longer follow the operator's commands.

Check whether your application requires that remedial measures be taken fon your machine in order to bring the driven consumer into a safe position (e.g. immediate stop).

Pump

Control

CAuTION!


Product description

4.3 Product identificationThe axial piston unit can be identified from the name plate. The following example shows an A18VLO name plate:

CNR:

MNR:SN:FD:

Rotation:

DE - 89275 Elchingen

Made in Germany

X1234567890Y

R90XXXXXXX SC: X12345678

Rexroth

2009W34m XXX kg

7202

Typ: A18VLO080DRS0E/10MRMK0E81-0

n XXXX min-1 P XXX kW

1

2

8

34

56

7

14

13

1211

10

9

A4VSO name plate A18VLOFig. 4:

Manufacturer1 Sample category (optional)2 Internal plant designation3 Direction of rotation (viewed on 4 drive shaft) – here: clockwiseSpecified area for test stamp5 Ground6 (optional)Power7

Bar code8 Speed9 Production date10 Serial number11 Material number of the 12 axial piston unit

13 Ordering codeCustomer material number14


Transport and storage

5 Transport and storage

Transporting the axial piston unit5.1

Risk of damage!Striking or impulsive forces could damage the axial piston unit.

Do not strike the coupling or drive shaft of the axial piston unit. fDo not set/place the axial piston unit on the drive shaft. fDo not strike sensitive fittings (e.g. sensors or valves). fDo not strike sealing surfaces (e.g. f service line ports).Leave the flange cover on the axial piston unit until shortly before the lines are fconnected.

Axial piston units can be transported with a forklift truck or with a lifting device.

Make certain that the forklift truck or lifting device has adequate lifting fcapacity.

Table 3: Dimensions and weightsSize 80 (A18VO) 107 (A18VO) 80 (A18VLO)Ground kg 20 24 24.1

Width mm The dimensions vary with the unit type. The values applicable for your axial piston unit can be found in the installation drawing (request if necessary).

Height mmDepth mm

The weight specifications may vary depending on the unit type.

Transporting with lifting device5.1.1 For transporting, the axial piston unit can be connected to a lifting device via a ring screw or a lifting strap.The drive shaft can be used to transport the axial piston unit as long as only outward (pulling) axial forces occur. Thus, you can suspend the axial piston unit from the drive shaft.

For all female threads, use a threaded plug from the same system of units and fof the correct size.To do this, screw a ring screw completely into the thread on the drive shaft. fThe thread sizes is stated in the installation drawing.Make sure that each ring screw can bear the total weight of the axial piston funit plus approx. 20 %.

You can hoist the axial piston unit as shown in Fig. 5 with the ring screw screwed into the drive shaft.

Fixing the ring screwFig. 5:

CAuTION!

Dimensions and weights

Transport with ring screw



f Place the lifting strap around the axial piston unit in such a way that it passes over neither the attachment parts (e.g. valves) nor such that the axial piston unit is hung from attachment parts (see Fig. 6).

Risk of injury!During transport with a lifting device, the axial piston unit can topple out of the lifting strap and cause injuries.

Use the widest possible lifting strap. fMake sure that the axial piston unit is securely fixated with the lifting strap. fOnly guide the axial piston unit by hand for fine positioning and to avoid foscillations.Never stand under or put you hands under suspended loads. f

Transport with lifting strapFig. 6:

Storing the axial piston unit5.2 • The storage areas must be free from corrosive materials and gasses.

The storage areas must be dry. •Ideal storage temperature: +5 °C to +20 °C. •Minimum storage temperature: 50 °C. •Maximum storage temperature: +60 °C. •Avoid intense lights. •Do not stack axial piston units and store them shockproof. •Do not store the axial piston unit on sensitive attachment parts, e.g. sensors. •For other storage conditions, see Table 4. •

Check the axial piston unit monthly to ensure proper storage. f

The axial piston units are provided exworks with corrosion protection packaging (corrosion protection film).The following table lists the maximum permissible storage times for an originally packed axial piston unit as per data sheet RE 90312.

Transport with lifting strap

wARNING!

Requirement

After delivery



Table 4: Storage time with factory corrosion protection

Storage conditions Standard corrosion protection

Long-term corrosion protection

Closed, dry room, uniform temperature between +5 °C and +20 °C. Undamaged and closed corrosion protection film.

Maximum 12 months Maximum 24 months

The warranty is rendered void if the requirements and storage conditions are not adhered to or after expiration of the maximum storage time (see Table 4).

Procedure after expiration of the maximum storage time:

Check the entire axial piston unit for damage and corrosion prior to 1. installation.

Check the axial piston unit for proper function and leaks during a test run.2.

If the storage time exceeds 24 months, both shaft seal rings must be replaced.3.

After expiry of the maximum storage time, we recommend that you have the axial piston unit inspected by your responsible Rexroth Service partner.

In the event of questions regarding repairs and spare parts, contact your responsible Rexroth Service partner or the service department of the manufacture's plant for the axial piston unit, see chapter "9.5 Spare parts" for further information.If a dismounted axial piston unit is to be stored, it must be preserved against corrosion for the duration of the storage.

The following instructions only refer to axial piston units which are operated with a mineraloil based hydraulic fluid. Other hydraulic fluids require preservation methods that are specifically designed for them. In such a case, consult with Rexroth Service (see chapter "9.5 Spare parts" for address).

Rexroth recommends the following procedure:

Clean the axial piston unit, see chapter "9.1 Cleaning and care".1.

Completely empty the axial piston unit.2.

For storage time up to 12 months: Moisten the inside of the axial piston unit 3. with mineral oil and fill with approx. 100 ml mineral oil. For storage time up to 24 months: Filling the axial piston unit with corrosion protection VCI 329 (20 ml). Fill via air bleed port "R", see chapter "6.4 Installing the axial piston unit", Figs. 14 to 16.

Plug all ports so that they are airproof.4.

Moisten the unpainted surfaces of the axial piston unit with mineral oil 5. or a suitable, easily removed corrosion protection agent, e.g. acidfree grease.

Package the axial piston unit airproof together with desiccant in corrosion 6. protection film.

Store the axial piston unit so that it is protected against jolts. 7. See "Requirement" in this chapter for further conditions.

After removal


Installation

6 InstallationPrior to installation, the following documents must be available:

Installation drawing for axial piston unit (can be obtained from your responsible •contact person at Rexroth)Hydraulic circuit diagram for the axial piston unit (in the installation drawing) •Hydraulic circuit diagram for the system (available from the system •manufacturer)Order confirmation (contains the preset data of the axial piston unit) •Data sheet for the axial piston unit (contains the technical data) •

6.1 unpackingThe axial piston unit is delivered in a corrosion protection film made of polyethylene material (PE).

Dispose of the packaging according to the environmental regulations of your fcountry.

Risk of parts falling outIf the packaging is not opened correctly, parts may fall out and damage the parts or even result in injury.

Place the packaging on a flat and solid surface. fOnly open the packaging from the top. f

6.2 Installation conditionsThe installation location and position of the axial piston unit essentially •determine the procedures during installation and commissioning (e.g. when filling and air bleeding the axial piston unit).Correct filling and air bleeding is necessary to prevent damage to the axial •piston unit and to maintain correct function.Note that you can expect certain installation positions to affect the control •device. Because of gravity, dead weight and case pressure, minor characteristic displacements and actuating time changes may occur.

Observe all f data specified in the data sheet, e.g. temperature, viscosity, purity of the hydraulic fluid and direction of rotation.Make sure that f the axial piston unit is air bled and filled with hydraulic fluid during commissioning and operation. This is also to be observed following relatively long standstill periods as the axial piston unit may empty via the hydraulic lines.The case drain fluid in the case interior must be directed to the reservoir via fthe highest case drain port. Use the line size which is appropriate for the port.To achieve favorable noise values, decouple all connecting lines from all fvibrationcapable components (e.g. reservoir) using elastic elements.

CAuTION!


Installation

Make certain that the intake fluid line and the case drain line flow into the freservoir below the minimum fluid level in all operating conditions. This will prevent air from being drawn in and foam from being formed.

1 230

0 12

-1

-0.20.8 abs.

21

S

Suction pressureFig. 7:

Absolute pressure gauge1 Standard pressure gauge2

Make certain that a minimum suction pressure of 0.8 bar absolute is present fat port "S" during operation and on cold starts in all installation positions and installation locations for the axial piston pump, see Fig. 7. See data sheet for additional values.The suction conditions improve with belowreservoir installation

Appropriate absolute cleanliness is required. The axial piston unit must be finstalled in a clean condition. Dirt contamination in the hydraulic fluid can seriously impair the function and service life of the axial piston unit.Do not use any cotton waste or linty cloths for cleaning. fUse suitable liquid detergents to remove lubricants and other difficultto fremove contamination. Cleaning agents must not penetrate the hydraulic system.

Risk of damage due to lack of lubrication!Sufficient lubrication must be guaranteed to prevent damage to the axial piston unit.

During installation, f make sure that the case is fully filled with hydraulic fluid for commissioning and operation (e.g. no air intrusion.Make sure that the suction line is always filled with f hydraulic fluid during commissioning and operation.

CAuTION!


Installation

6.3 Installation positionThe following installation positions are permissible. The shown piping layout illustrates the basic layout.

The case drain chamber is internally connected to the suction chamber. A case drain line between the case and reservoir is not required. However, when using the DRS controller, a case drain line from port "T" to the reservoir is, however, generally necessary to maintain thermal stability (not necessary for EP control).

6.3.1 Below-reservoir installation (standard)Belowreservoir installation is when the axial piston unit is installed outside of the reservoir below the minimum fluid level.

Recommended installation positions: 1 and 2.

1 2

S

SB

TR

ht min

hminamin

S

MS

SB

T

ht min

hminamin

Below-reservoir installation with installation positions 1–2Fig. 8:

R Air bleed port SB Baffle (baffle plate)

S Suction port ht min Minimum necessary immersion depth (200 mm)

T Reservoir port (DRS only) hmin Minimum necessary spacing from suction port to reservoir base (100 mm)

MS Measuring suction pressure amin When designing the reservoir, ensure adequate distance between the suction line and the case drain line. This prevents the heated, return flow from being drawn directly back into the suction line.

Below-reservoir installationTable 5: Installation position Air bleeding Filling1 R S

2 MS S


Installation

6.3.2 Above-reservoir installationAbovereservoir installation is when the axial piston unit is installed above the minimum fluid level of the reservoir.


During installation, f make sure that the case is fully filled with hydraulic fluid for commissioning and operation (e.g. no air intrusion).Check the hydraulic fluid level in the case interior regularly; if necessary, frecommission. With abovereservoir installation, the case interior may drain via the case drain line after longer standstill periods (air enters via the shaft seal ring) or via the service line (gap leakage). The bearings are thus insufficiently lubricated after recommissioning.Make sure that the suction line is always filled with hydraulic fluid during fcommissioning and operation.

Observe the maximum permissible suction height hS max = 800 mm. The permissible suction height hs is derived from the total pressure loss.

3 4

S

SB

TR

hS max

ht min

hminamin

L SMS

SB

T

hS max

ht min

hmin amin

L

Above-reservoir installation with installation positions 3–4Fig. 9:

L Filling / air bleeding SB Baffle (baffle plate)

R Air bleed port ht min Minimum necessary immersion depth (200 mm)

S Suction port hmin Minimum necessary spacing from suction port to reservoir base (100 mm)

T Reservoir port (DRS only) hS max Maximum permissible suction height (800 mm)

MS Measuring suction pressure amin When designing the reservoir, ensure adequate distance between the suction line and the case drain line. This prevents the heated, return flow from being drawn directly back into the suction line.

Above-reservoir installationTable 6: Installation position Air bleeding Filling3 R L

4 MS L

CAuTION!


Installation

Installing the axial piston unit6.4

Systems which are not shut down pose a risk of injury!Working on operating systems poses a danger to life and limb. The work steps described in this chapter must only be performed on systems which are at a standstill. Before beginning work:

Ensure that the engine cannot be switched on. fEnsure that all powertransmitting components and connections (electric, fpneumatic, hydraulic) are switched off according to the manufacturer’s instructions and are secured against being switched on again. If possible, remove the main fuse for the system.Ensure that the system is completely hydraulically relieved and depressurized. fPlease follow the system manufacturer's instructions.Only qualified personnel (see chapter "2.3 Personnel qualifications") are fauthorized to install the axial piston unit.

6.4.1 Preparation

Check the delivery contents for completeness and transport damages.1.

Compare the material number and designation (ordering code) with the details 2. in the order confirmation.

If the material number for the axial piston unit does not correspond to the one in the order confirmation, contact Rexroth Service for clarification, see chapter "9.5 Spare parts" for address.

Before installing, completely empty the axial piston unit to prevent mixing with 3. the hydraulic fluid used in the system.

Check the direction of rotation of the axial piston unit (on the name plate) and 4. make sure that this corresponds to the direction of rotation of the engine.

L

R

Fig. 11: Direction of rotation

L Counterclockwise

R Clockwise

The direction of rotation as specified on the name plate determines the direction of rotation of the axial piston unit as viewed on the drive shaft. For information on the direction of rotation of the engine, please refer to the engine manufacturer's instruction manual.

DANGER!


Installation

6.4.2 DimensionsThe installation drawing contains the dimensions for all connections and ports on the axial piston unit. Also observe the manuals provided by the manufacturers of the other components when selecting the required tools.

6.4.3 General instructionsDuring installation (and disassembly) of the axial piston unit, observe the following general instructions and handling instructions:

To drive the input or output drive of an axial piston unit with the aid of a cardan •shaft, vibrations may occur which may result in leakages on the shaft seal ring of the axial piston unit depending on the temperature and frequency.

Fix the axial piston unit so that the expected forces and torques can be ftransferred without any danger.The permissible axial loading of the drive shaft, the permissible torsional fvibration, the optimum direction of load force, as well as the speed limits can be found in the data sheet.

Radial forces on the drive shaft are not permissible.

Risk of damage!Striking or impulsive forces could damage the axial piston unit.

Do not strike the coupling or drive shaft of the axial piston unit. fDo not set/place the axial piston unit on the drive shaft. fDo not strike sensitive fittings (e.g. sensors or valves). fDo not strike sealing surfaces (e.g. suction port or through drive). f

How to install the axial piston unit depends on the connecting elements to the drive side. The following descriptions explain the installation of the axial piston unit:

with a clutch •on a gearbox •

6.4.4 Installation with clutchThe installation procedure for the axial piston unit with a coupling is described in detail in the following:

Install the specified coupling half onto the drive shaft of the axial piston unit 1. according to the instructions of the coupling manufacturer.

The drive shaft of the axial piston unit is equipped with a threaded bore. Use this threaded bore to pull the coupling element onto the drive shaft. Refer to the installation drawing for the dimensions of the threaded bore.

Make certain that the installation location is clean and free from dirt and 2. contaminants.

Clamp the coupling hub onto the drive shaft or ensure permanent lubrication 3. of the drive shaft. This prevents the formation of frictional corrosion and the associated wear.

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Installation

Transport the axial piston unit to the installation location.4.

Install the coupling onto the input according to the instructions of the coupling 5. manufacturer.

The axial piston unit may not be bolted down until the coupling has been correctly installed.

Fix the axial piston unit at the installation location.6.

If necessary, details on the required tools and tightening torques for the fixing 7. screws are available from the machine or system manufacturer.

For bell housing installation, check the coupling axial play through the bell –window according to the manufacturer's instructions.For flange installation, align the support for the axial piston unit with the –input.

When using flexible couplings, check that the input is free of resonance after 8. completing the installation.

6.4.5 Installation on a gearboxThe installation layout for the axial piston unit on a gearbox is described in detail in the following.After installing on a gearbox, the axial piston unit is covered and is difficult to access:

Therefore, before installing, make sure that the centering spigot centers the faxial piston unit (observe tolerances) and that no impermissible axial or radial forces act on the drive shaft of the axial piston unit (installation length).Protect the spline of the drive shaft from frictional corrosion by providing fpermanent lubrication.

Completing6.4.6 installation

Remove any mounted transport screws.1.

Remove the transport protection. 2. The axial piston unit was delivered with protective covers and plastic plugs or threaded plugs. These must be removed before connecting. Use appropriate tools.

Make sure that the sealing and functional surfaces are not damaged. 3. If sealing or functional surfaces are damaged, contact your responsible Rexroth Service partner or the service department of the manufacture's plant for the axial piston unit.

Ports which are intended for connecting lines are provided with plastic plugs or metal threaded plugs which serve as transport protection. All ports needed for the function must be connected (see Table 7 "Ports on A18V(L)O Series 10"). Failure to comply with this could lead to malfunctions or damage. If no connection is made, these ports must be plugged with a suitable metal threaded plug since the plastic plugs are not pressureproof.


Installation

Risk of damage to persons and property!Operating the axial piston unit with plastic plugs can result in injuries or damage to the axial piston unit.

Before commissioning, remove all plastic plugs and replace them with fsuitable, pressureproof, metal threaded plugs.

1

1

Fig. 12: Removing transport protection A18VO

1

1

1

Removing transport protection A18VLOFig. 13:

Plastic plugs / 1 threaded plugs

The adjusting screws are protected against unauthorized resetting by means of protective caps. Removal of the protective caps will void the warranty. If you need to modify the setting, please contact your responsible Rexroth Service (address as to chapter "9.5 Spare parts").

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Installation

Hydraulically connecting the axial piston unit6.4.7 The machine or system manufacturer is responsible for dimensioning the lines. The axial piston unit must be connected to the rest of the hydraulic system in accordance with the hydraulic circuit diagram of the machine or system manufacturer.

Damage to the axial piston unit!Hydraulic lines and hoses that are installed under mechanical stress generate additional mechanical forces during operation which will reduce the service life of the axial piston unit and the entire machine or system.

Install hydraulic lines and hoses without mechanical stress. f

Risk of damage!Generally, a minimum permissible suction pressure at port "S" is specified for axial piston pumps in all installation positions. If the pressure at port "S" drops below the specified values, damage may occur which may lead to the axial piston pump being damaged beyond repair.

Make sure that the necessary suction pressure is f not undercut. This is influenced by:

the piping – (e.g. suction crosssection, pipe diameter, length of suction line)the position of the reservoir –the viscosity of the hydraulic fluid –if fitted, a – filter cartridge or check valve in the suction line (regularly check the level of contamination of the filter cartridge)

Only connect suitable hydraulic lines to the service and function ports.

wear and malfunctionsThe cleanliness of the hydraulic fluid has a considerable impact on the cleanliness and service life of the hydraulic system. Any contamination of the hydraulic fluid leads to wear and malfunctions. In particular, contaminants, such as welding beads or metal cuttings in the hydraulic lines, may damage the axial piston unit.

Absolute cleanliness is required. fThe axial piston unit must be installed in a clean condition. fMake certain that all ports, hydraulic lines and addon units f(e.g. measuring equipment) are clean.Make certain that no contaminants enter when sealing the ports. fMake certain that no detergents enter the hydraulic system. fDo not use any cotton waste or linty cloths for cleaning. fDo not use hemp as a sealant under any circumstances. f

Observe the following notes when routing the suction, pressure and case drain lines.

Make certain that the suction line (pipe or hose) is as short and straight as fpossible.The line cross section of the suction line is to be sized so that the minimum fpermissible pressure at the suction port and the maximum permissible pressure are not exceeded.With the suction line f make sure that all junctions are air tight and that the pressure capability of all hoses meet specifications, also with respect to the external air pressure.

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Notes on routing the lines


Installation

With the pressure lines, make certain that the pipes, hoses and connecting felements are approved for the operating pressure range.Always route the case drain lines so that the housing is constantly filled fwith hydraulic fluid and to ensure that no air gets through the shaft seal ring even during extended standstill periods. The case internal pressure must not exceed the limit values listed for the axial piston unit in the data sheet under any operating conditions. The case drain line in the reservoir must end up below the minimum fluid level under all conditions (see chapter "6.3 Installation position").

The ports and fixing threads are designed for the maximum pressure specified in the data sheet. The machine or system manufacturer must ensure that the connecting elements and lines correspond to the specified operating conditions (pressure, flow, hydraulic fluid, temperature) with the necessary safety factors.

To connect the axial piston unit to the hydraulic system:

Remove the threaded plugs at the ports at which the connections are to be 1. made according to the hydraulic circuit diagram.

Only use clean hydraulic lines 2. or rinse out the hydraulic system with a flushing unit before commissioning. Follow the instructions of the flushing unit manufacturer.

Connect the lines in accordance with the installation drawing and the machine 3. or system circuit diagram. Make sure that all ports are piped up or plugged with suitable threaded plugs.

The installation drawing contains the dimensions for all connections and ports on the axial piston unit. Also observe the instructions provided by the manufacturers of the other hydraulic components when selecting the required tools.

Make certain that the union nuts on the fittings and flanges are tightened 4. correctly (observe the manufacturer's tightening torques!). Mark all checked fittings using e.g. a permanent marker pen.

Make certain that the pipes and hose lines and every combination of 5. connecting piece, coupling or connecting point with hoses or pipes have been inspected by a technically qualified person for safe working condition.

Procedure


Installation

Port overview of A18VO Series 10 with DRS controlFig. 14:

TX

R

S

X2

MA

MS

A

M1

Port overview of A18VLO Series 10 with DRS.E controlFig. 15:

S

T X

A

S

T X

TX

R

MSMA

MS

MA

A

M1 M1

Port overview


Installation

R

S

A

A

S

MS

MA

MA

MS

M1M1

Port overview of A18VO Series 10 with EP2 controlFig. 16:

Ports Table 7: A18V(L)O Series 10Designation Port for Standard Maximum

pressure [bar]1)State

A Service line DIN ISO 228 400 O

S Suction line DIN ISO 228 2 O

T Reservoir (DRS only) DIN 38522) 2 O

MA Measuring pressure A DIN 38522) 400 X

MS Measuring suction pressure

DIN 38522) 2 X

M1 Measuring stroking chamber

DIN 38522) 400 X

R Air bleed DIN 38522) 2 X3)

X Load pressure (load sensing)

ISO 119262) 400 O

X24) Operating pressure pump

DIN 38522) 400 O

1 ) Short term pressure spikes may occur depending on the application. Keep this in mind when selecting measuring equipment and fittings.

2)The countersink may be deeper that specified in the standard.3)Only open port "R" for filling and air bleeding.4)Only onO = Must be connected (plugged on delivery).X = Plugged (in normal operation).


Installation

The following tightening torques apply:

Threaded hole of the axial piston unit: •The maximum permissible tightening torques MG max are maximum values of the female threads and must not be exceeded. For values, see the following table.Fittings: •Observe the manufacturer's instructions regarding the tightening torques of the fittings used.Fixing screws: •For fixing screws with metric ISO thread according to DIN 13 or thread according to ASME B1.1, we recommend checking the tightening torque individually according to VDI 2230.Threaded plugs: •For the metallic threaded plugs supplied with the axial piston unit, the required tightening torques of threaded plugs MV apply. For values, see the following table.

Tightening torques of the female threads and threaded plugsTable 8:

Ports Maximum permissible tightening torque of the female threads MG max

Required tightening torque of the threaded plugs MV

wAF hexagon socket for the threaded plugsStandard Thread size

DIN 3852 M10 x 1 30 Nm 12 Nm 5 mmM12 x 1.5 50 Nm 25 Nm 6 mmM18 x 1.5 66 Nm 60 Nm 8 mm

ISO 11926 7/1620 UNF2B 40 Nm 15 Nm 3/16 inDIN ISO 228 G1 480 Nm – –

G1 1/4 720 Nm – –

The axial piston units are used in application areas with metric as well as with Imperial systems of units.Both the system of units and the size of female thread and threaded plug (e.g. threaded plug) must match.Due to the limited options for visually detecting differences, there is a risk of mixups.

Risk of damage to persons and property!If a threaded plug which is of a different measurement system and size with respect to the female thread is pressurized, the threaded plug may loosen itself or even be ejected from the hole in a projectilelike manner. This can result in serious injury and damage to equipment. Hydraulic fluid can be discharged from this leakage point.

Use the drawings (installation drawing/data sheet) to determine the required fthreaded plug for each fitting.Make certain that there are no mixups when installing fittings, fixing screws fand threaded plugs.For all female threads, use a threaded plug from the same system of units and fof the correct size.

Electrically connecting the axial piston unit6.4.8 The machine or system manufacturer is responsible for the layout of the electric control.Electrically controlled axial piston units must be connected in accordance with the electric circuit diagram of the system manufacturer.

Tightening torques

Risk of mix-ups with threaded connections

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Installation

For axial piston units with electric control or mounted sensors, note for example:

the permissible voltage range •the permissible current •the correct connections •the recommended electric control units. •

These parameters can be found in data sheet RE 92270.

Missing seals and connections lead to noncompliance with the protection class!Fluids and contaminants may penetrate and damage the product beyond repair.

Prior to installation, make sure that all seals and connectors are tight. f

Short circuit in event of penetrating hydraulic fluid!Fluid can penetrate the product and cause a short circuit.

Do not install electrically controlled axial piston units in a reservoir below the freservoir fluid level (insidereservoir installation).

Switch off power supply to the relevant system component.1.

Electrically connect the axial piston unit (12 or 24V).2.

If necessary, you can change the position of the connector by turning the solenoid.To do this, proceed as follows:

Loosen the mounting nut (1. 1) of the solenoid. To do this, turn the mounting nut (1) one turn counterclockwise.

Turn the solenoid body (2. 2) to the desired position.

Retighten the mounting nut. Tightening torque of the mounting nut: 5+1 Nm.3.

For further details and technical data, e.g. regarding the selection of a suitable mating connector, refer to data sheet RE 92270.

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Changing connector orientation

2

1


Commissioning

7 Commissioning

Danger while working in the danger zone of a machine or system!It is not permissible to work in the danger zone of a machine or system.

The machine or system may only be commissioned if safe working is ensured. fPay attention to and rectify potential danger sources before commissioning fthe machine or system.Nobody may stand in the danger zone of the machine or system. fThe emergency stop button for the machine or system must be within the foperator's reach.Always follow the instructions of the machine or system manufacturer during fcommissioning.

Risk of damage to persons and property!Commissioning of the axial piston unit requires basic mechanical and hydraulic knowledge.

Only qualified personnel (see chapter "2.3 Personnel qualifications") are fauthorized to commission the axial piston unit.

Risk of toxication and injury!Contact with hydraulic fluids may cause health damage (e.g. eye injury, skin damage, toxication upon inhalation).

Always check the lines for wear and damage before each commissioning. fWhile performing these checks, wear safety gloves, safety glasses and fsuitable working clothes.If hydraulic fluid should, nevertheless, come into contact with your eyes or fpenetrate your skin, consult a doctor immediately.When working with hydraulic fluids, strictly observe the safety instructions fprovided by the hydraulic fluids manufacturer.

Fire hazard!Hydraulic fluid is easily flammable.

Keep open flames and ignition sources away from the axial piston unit. f

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Commissioning

7.1 First commissioning

Risk of damage to the product!Any contamination of the hydraulic fluid leads to wear and malfunctions. In particular, contaminants, such as welding beads or metal cuttings in the hydraulic lines, may damage the axial piston unit.

Ensure utmost cleanliness during commissioning. fMake sure that no contaminants may penetrate when sealing the gauge ports f .

Risk of damage to the product!If you commission the axial piston unit without or with insufficient hydraulic fluid, the axial piston unit could be damaged immediately, possibly beyond repair.

When commissioning or recommissioning a machine or system, make sure fthat the case interior and the suction and service lines of the axial piston unit are filled with hydraulic fluid and remain filled during operation.

When commissioning the axial piston unit, observe the basic safety instructions and intended use provided in chapter "2 General safety instructions".

Connect the pressure gauge to the measurement points provided for operating fpressure, case pressure and suction pressure to allow the technical data to be checked during initial operation.

Filling the axial piston unit7.1.1 You will require an approved hydraulic fluid:The machine or system manufacturer can provide you with exact details of the hydraulic fluid. Details on minimum requirements for mineraloil based hydraulic fluids and environmentally acceptable hydraulic fluids for the axial piston unit are available in the Rexroth publications RE 90220 and RE 90221, respectively.To ensure the functional reliability of the axial piston unit, at least cleanliness level 20/18/15 according to ISO 4406 is necessary for the hydraulic fluid. At very high hydraulic fluid temperatures (+90 °C to maximum +115 °C), a cleanliness level of at least 19/17/14 according to ISO 4406 is necessary. For permissible temperatures, see the data sheet.


Make sure that the case is fully filled with hydraulic fluid for commissioning fand operation (e.g. no air intrusion).Make sure that the suction line is always filled with hydraulic fluid during fcommissioning and operation.With abovereservoir installation, an axial piston pump must be moved to ffull swivel angle after no more than 3 seconds during commissioning and recommissioning. Make sure that the axial piston pump really does suck in hydraulic fluid and build up pressure.

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Commissioning

The axial piston unit should be filled with a filling unit (10 µm filter grade). The axial piston unit must not be operated while it is being filled with the filling unit.

Danger of environmental contamination!The discharge or spillage of hydraulic fluid while filling the axial piston unit can lead to environmental pollution and contamination of the groundwater.

When filling and changing the hydraulic fluid, always place a drip tray under fthe axial piston unit.Observe the information in the safety data sheet for the hydraulic fluid and the fspecifications provided by the system manufacturer.

Fill and air bleed the axial piston unit via the appropriate ports, see chapter 1. "6.3 Installation position". The hydraulic lines of the system must also be filled.

Test the direction of rotation of the engine. To do this, rotate the engine briefly 2. at the lowest rotational speed (inching). Make sure that direction of rotation of the axial piston unit matches the details on the name plate, see also chapter "4.3 Product identification", Fig. 4: Name plate.

Operate the axial piston pump at a lower speed (starter speed for internal 3. combustion engines or inching operation for electric motors) until the pump system is completely filled and bled. To inspect, drain the hydraulic fluid at the case drain port and wait until it drains without bubbles.

Make certain that all ports are either piped up or plugged according to the 4. general circuit diagram.

If a shutoff valve is used in the suction and/or case drain line, make sure that 5. the axial piston unit is not operated with the shutoff valves closed.

Testing the hydraulic fluid supply7.1.2 The axial piston unit must always have a sufficient supply of hydraulic fluid. For this reason, the supply of hydraulic fluid must be ensured at the start of the commissioning process.When you test the hydraulic fluid supply, constantly monitor the noise development and check the hydraulic fluid level in the reservoir. If the axial piston unit becomes louder (cavitation) or the case drain fluid is discharged with bubbles, this is an indication that the axial piston unit is not being sufficiently supplied with hydraulic fluid.Notes on troubleshooting can be found in chapter "14 Troubleshooting".To test the hydraulic fluid supply:

Allow the engine to run at the lowest speed. The axial piston unit must be 1. operated without load. Pay attention to leakage and noise.

When doing this, check the case drain line of the axial piston unit (only with 2. DRS and DRS.E control). The case drain fluid should not contain any bubbles.

Increase the load and check whether the operating pressure rises as 3. expected.

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Commissioning

Check 4. the suction pressure at port "S" of the axial piston pump at nominal speed and maximum flow. Refer to data sheets RE RE 92270 and RE 92280 for the permissible value.

At maximum pressure5. , Check the case drain pressure at connected port "T". Refer to data sheets RE RE 92270 and RE 92280 for the permissible value.

7.1.3 Performing functional test

Risk of injury in case of incorrectly connected machine or system!Any change of the connections will lead to malfunctions (e.g. lift instead of lower) and thus represents a corresponding danger to persons and equipment.

When connecting hydraulic components, observe the specified piping faccording to the hydraulic circuit diagram of the machine or system manufacturer.

Once you have tested the hydraulic fluid supply, you must perform a functional test on the machine or system. The functional test should be performed according to the instructions of the machine or system manufacturer.The axial piston unit is checked for functional capability before delivery according to the technical data. During commissioning, it must be ensured that the axial piston unit was installed as intended in the machine or system.

Check in particular whether the axial piston unit builds up pressure after the fengine is started and make sure that the case pressure does not rise to an impermissible level.If necessary, remove the pressure gauge and plug the ports so that they are fpressureproof.

7.1.4 Performing flushing cycleIn order to remove foreign particles from the system, Rexroth recommends a flushing cycle for the entire system.

The flushing cycle must be performed with an additional flushing unit. Follow the instructions of the flushing unit's manufacturer for the exact procedure during the flushing cycle. To avoid internal contamination, the axial piston unit must not be included in the flushing cycle.

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Commissioning

7.2 Recommissioning after standstillDepending on the installation conditions and ambient conditions, changes may occur in the system which make recommissioning necessary.Among others, the following criteria may make recommissioning necessary:

Air in the hydraulic system •Water in the hydraulic system •Aged hydraulic fluid •Other contamination •

Before recommissioning, proceed as described in chapter f"7.1 First commissioning".

7.3 Running-in phaseThe bearings and sliding surfaces are subject to a runningin phase. The increased friction at the start of the runningin phase results in increased heat development which decreases with increasing operating hours. The volumetric and mechanicalhydraulic efficiency increases as well through the conclusion of the runningin phase of approx. 10 operating hours.

Risk of damage by insufficient viscosity!Increased temperature of the hydraulic fluid can cause the viscosity to reach an impermissible range.

Monitor the operating temperature during the runningin phase, f e.g. by measuring the case drain temperature at port "T" (only with DRS and DRS.E control.Adjust the loading (pressure, rpm) of the axial piston unit if impermissible foperating temperatures and/or viscosities occur.

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Operation

8 OperationThe product is a component which requires no settings or changes during operation. For this reason, this chapter of the manual does not contain any information on adjustment options. Use the product only within the performance range provided in the technical data. The machine or system manufacturer is responsible for the proper project planning of the hydraulic system and its control.


Maintenance and repair

9 Maintenance and repair

9.1 Cleaning and care

Damage to the surface caused by solvents and aggressive detergents!Aggressive detergents may damage the seals on the axial piston unit and cause them to age faster.

Never use solvents or aggressive detergents. f

Damage to the hydraulic system and the seals!A power washer's water pressure could damage the electronics and the seals of the axial piston unit.

Do not point the power washer at sensitive components, e.g. shaft seal ring, felectrical connections and electrical components.

For cleaning and care of the axial piston unit, observe the following:

Plug all openings with suitable protective caps/devices. fCheck whether all seals and fittings on the connections are securely seated fto ensure that no moisture can penetrate into the axial piston unit during cleaning.Use only water and, if necessary, a mild detergent to clean the axial piston funit.Remove coarse dirt from the outside of the machine and keep sensitive fcomponents such as solenoids, valves, indicators and sensors clean.

9.2 InspectionIn order to enable long and reliable operation of the axial piston unit, Rexroth recommends testing the hydraulic system and axial piston unit on a regular basis and documenting the following operating conditions:

Inspection scheduleTable 9: Task to be carried out IntervalHydraulic system Check level of hydraulic fluid in the reservoir. daily

Check the operating temperature (comparable load conditions) at the case drain port and in the reservoir.

weekly

Perform a hydraulic fluid analysisViscosity, aging, contamination

yearly or every 2000 h (which ever occurs first)

Axial piston unit

Check axial piston unit for leakage. Early detection of hydraulic fluid loss can help to find errors on the machine or system and to rectify them. For this reason, Rexroth recommends that the axial piston unit and system always be kept in a clean condition.

daily

Check axial piston unit for noise development. dailyCheck fasteners for tight seating. All fasteners have to be checked when the system is switched off, nonpressurized and cooled down.

monthly

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9.2.1 Checking the inspection hole

Risk of property damage!If hydraulic fluid leaks from the inspection hole, the axial piston unit as well as the power takeoff may drain and be damaged.

Check the inspection hole daily for leakage. f

Check the inspection hole ( f 1) of the axial piston unit daily for leakage.

1

Inspection holeFig. 17:

The inspection hole is protected against external contamination with a cover. The cover must not be removed.

If hydraulic fluid leaks from the inspection hole, at least one of the two shaft fseal rings is leaky. Both shaft seal rings of the axial piston unit must be replaced.

In the event of questions regarding repair and spare parts, contact your responsible Rexroth Service partner or the service department of the manufacture's plant for the axial piston unit, see chapter "9.5 Spare parts" for further information.

9.3 MaintenanceThe axial piston unit is low maintenance when used as intended.The service life of the axial piston unit is heavily dependent on the quality of the hydraulic fluid. For this reason, we recommend changing the hydraulic fluid at least once per year or every 2000 operating hours (which ever occurs first) or having it analyzed by the hydraulic fluid manufacturer or a laboratory to determine its suitability for further use.The service life of the axial piston unit is limited by the service life of the bearings fitted. The service life can be requested from the responsible Rexroth Service partner, see "9.5 Spare parts" for address. Based on these details, a maintenance period is to be determined by the system manufacturer for the replacement of the bearings and included in the maintenance schedule of the hydraulic system.

CAuTION!



9.4 RepairRexroth offers a comprehensive range of services for the repair of Rexroth axial piston units.Repairs to the axial piston unit may only be performed by authorized, skilled and instructed personnel.

Only use genuine spare parts from Rexroth for repairing the Rexroth axial fpiston units.

Tested and preinstalled original Rexroth assembly groups allow for successful repair requiring only little time.

9.5 Spare parts

Damage to persons and property due to faulty spare parts!Spare parts that do not meet the technical requirements specified by Rexroth may cause personal injury or property damage.

Use only original spare parts from Rexroth. f

The spare parts lists for axial piston units are order specific. When ordering spare parts, quote the material and serial number of the axial piston unit as well as the material numbers of the spare parts.Address all questions regarding spare parts to your responsible Rexroth Service partner or the service department of the manufacture's plant for the axial piston unit.

Bosch Rexroth AG Glockeraustraße 4 89275 Elchingen, Germany Tel. +49 (0) 73 08820 Fax +49 (0) 73 0872 74 [email protected] For the addresses of foreign subsidiaries, please refer to www.boschrexroth.com/adressen

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Decommissioning

10 DecommissioningThe axial piston unit is a component that does not require decommissioning. For this reason, this chapter of the manual does not contain any information.For details about how to remove or replace your axial piston unit, please refer to chapter "11 Removal and replacement".

11 Removal and replacement

11.1 Required toolsRemoval can be performed using standard tools. No special tools are necessary.

11.2 Preparing for removal

Risk of injuries due to removing under pressure and voltage!If you do not switch off the pressure and power supply before removing the product, you may get injured or the device or system components may be damaged.

Make certain that the relevant system components are not under pressure or fvoltage.

Decommission the entire system as described in the overall manual for the 1. machine or system.

Protect the complete system against being energized.2.

Relieve the hydraulic system according to the instructions of the machine or 3. system manufacturer.

11.3 Removing the axial piston unitProceed as follows to remove the axial piston unit:

Make sure that the hydraulic system is nonpressurized.1.

Check whether the axial piston unit has cooled down far enough so that it can 2. be removed without danger.

For belowreservoir installation, before removing the axial piston unit from the 3. complete system, seal the connection to the reservoir or drain the reservoir.

Place a drip tray under the axial piston unit to collect any hydraulic fluid that 4. may escape.

wARNING!


Removal and replacement

Danger of environmental contamination!The discharge or spillage of hydraulic fluid while removing the axial piston unit can lead to environmental pollution and contamination of the groundwater.

When draining the hydraulic fluid, always place a drip tray under the axial fpiston unit.Observe the information in the safety data sheet for the hydraulic fluid and the fspecifications provided by the system manufacturer.

To do this, loosen the lines and collect the escaping hydraulic fluid 5. in the drip tray.

Remove the axial piston unit. Use a suitable lifting device.6.


Plug all openings.8.

Preparing the components for storage or 11.4 further use

Proceed as described in section "5.2 Storing the axial piston unit". f

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Disposal

12 DisposalObserve the following points when disposing of the axial piston unit:


Dispose of the hydraulic fluid according to the national regulations of your 2. country.

Remove the axial piston unit into its individual parts and properly recycle 3. these parts.

Separate parts by:4. Cast parts –Steel –Aluminum –Nonferrous metal –Electronic waste –Plastic –Seals. –

12.1 Environmental protectionCareless disposal of the axial piston unit, the hydraulic fluid and the packaging material could lead to pollution of the environment.

Therefore, dispose of the axial piston unit, the hydraulic fluid and the fpackaging material in accordance with the currently applicable regulations in your country.Dispose of residual hydraulic fluid in accordance with the applicable safety fdata sheets for these hydraulic fluids.

13 Extension and conversionDo not convert the axial piston unit. This also includes a modification of the adjusting screws.

The warranty from Rexroth only applies to the delivered configuration. In case of extensions or conversions, the warranty will become void.

Adjusting screws are protected against unauthorized resetting by means of protective caps. Removal of the protective caps will void the warranty. If you need to modify the setting, please contact your responsible Rexroth Service (address as to chapter "9.5 Spare parts").


Troubleshooting

14 TroubleshootingThe following table may assist you in troubleshooting. The table makes no claim for completeness.In practical use, problems which are not listed here may also occur.

How to proceed for troubleshooting14.1 Always act systematically and targeted, even under pressure of time. fRandom and imprudent removal and readjustment of settings could result in the inability to ascertain the original error cause.First obtain a general overview of how your product works in conjunction with fthe entire system.Try to determine whether the product worked properly in conjunction with the fentire system before the error occurred.Try to determine any changes of the entire system in which the product is fintegrated.

Were there any changes to the product's application conditions or operating –range?Were there any changes (conversions) or repairs on the complete system –(machine / system, electrics, control) or on the product? If yes, which?Has the – hydraulic fluid been changed?Was the product or machine operated as intended? –How did the malfunction appear? –

Try to get a clear idea of the error cause. Directly ask the (machine) operator. fIf you cannot rectify the error, contact one of the contact addresses which can fbe found under: www.boschrexroth.com/adressen.


Troubleshooting

14.2 Malfunction table

Malfunction table for variable pumpsTable 10:

Malfunction Possible cause Remedy

Unusual noises Drive speed too high. Machine or system manufacturer.

Wrong direction of rotation. Ensure correct direction of rotation.

Insufficient suction conditions, e.g. air in the suction line, insufficient diameter of the suction line, viscosity of the hydraulic fluid too high, suction height too high, suction pressure too low, contaminants in the suction line.

Machine or system manufacturer (e.g. optimize inlet conditions, use suitable hydraulic fluid).

Completely air bleed axial piston unit, fill suction line with hydraulic fluid.

Remove contaminants from the suction line.

Improper fixing of the axial piston unit. Check fixing of the axial piston unit according to the specifications of the machine or system manufacturer. Observe tightening torques.

Improper fixing of the attachment parts, e.g. coupling and hydraulic lines.

Fix attachment parts according to the information provided by the coupling or fitting manufacturer.

Mechanical damage to the axial piston unit (e.g. bearing damage).

Exchange axial piston unit, contact Rexroth Service.

No or insufficient flow Faulty mechanical input (e.g. defective coupling).

Machine or system manufacturer.

Drive speed too low. Machine or system manufacturer.





Hydraulic fluid not in optimum viscosity range. Use suitable hydraulic fluid (machine or system manufacturer).

External control of the control device defective. Check external control (machine or system manufacturer).

Insufficient pilot pressure or control pressure. Check pilot pressure or control pressure, contact Rexroth Service.

Malfunction of the control device or controller of the axial piston unit.

Contact Rexroth Service.

Wear of axial piston unit. Exchange axial piston unit, contact Rexroth Service.

Mechanical damage to the axial piston unit. Exchange axial piston unit, contact Rexroth Service.


Troubleshooting

Malfunction table for variable pumpsTable 10:

Malfunction Possible cause Remedy

No or insufficient pressure Faulty mechanical input (e.g. defective coupling).


Drive power too low. Machine or system manufacturer.





Hydraulic fluid not in optimum viscosity range. Use suitable hydraulic fluid (machine or system manufacturer).

External control of the control device defective. Check external control (machine or system manufacturer).

Insufficient pilot pressure or control pressure. Check pilot pressure or control pressure, contact Rexroth Service.

Malfunction of the control device or controller of the axial piston unit.



Mechanical damage to the axial piston unit (e.g. bearing damage).

Exchange axial piston unit, contact Rexroth Service.

Output unit defective (e.g. hydraulic motor or cylinder).


Pressure/flow fluctuations Axial piston unit not or insufficiently air bled. Completely air bleed axial piston unit.





Excessive hydraulic fluid and case temperature

Excessive inlet temperature at the axial piston unit.

Machine or system manufacturer: inspect system, e.g. malfunction of the cooler, insufficient hydraulic fluid in the reservoir.

Malfunction of the pressure control valves (e.g. highpressure relief valve, pressure cutoff, pressure controller).



Instability/vibrations Setpoint value not stable. Machine or system manufacturer.

Resonance in the case drain line. Machine or system manufacturer.

Malfunction in control device or controller. Contact Rexroth Service.


Technical data

15 Technical dataThe technical data for your axial piston unit can be found on data sheets RE 92270 (A18VO) and RE 92280 (A18VLO).The data sheets can be found on the internet underwww.boschrexroth.com/axialkolbenpumpen

The preset technical data of your axial piston unit can be found in the order confirmation.

Appendix16

16.1 Address directory For the addresses of foreign subsidiaries, please refer to www.boschrexroth.com/adressen


Alphabetical index

AAbbreviations 5Abovereservoir installation 20Address directory 46Air bleed port 19, 20Assembly 11

BBelowreservoir installation 19

CCare 37Case 11Caution 8Changing solenoid position 30Cleaning 37Commissioning 31

First 32Connecting

Electrical 29Hydraulic 25

Control valve 11Conversion 42Corrosion protection 15Cylinder 11

DDanger 8Decommissioning 40Delivery contents 10Device description 11Dimensions 14, 22Direction of rotation 21Drive shaft 11

EEnvironmental protection 42

FFilling 32Flushing cycle 34Functional description

Control 12Open circuit 11Pump 12

Functional test 34

GGeneral instructions 22

HHydraulic fluid 32

IIdentification 13Inspection 37Inspection hole 38Installation 17, 21

Completing 23General instructions 22On a gearbox 23Preparation 21With clutch 22

Installation conditions 17Installation Position 19

Abovereservoir installation 20Belowreservoir installation 19

InstructionsGeneral 8, 22

LLens plate 11Lifting device 14Lifting strap 15

MMaintenance 37, 38Malfunction table 44

NName plate 13

OObligations

Of the operator 9Operation 36Ordering code 13

PPerformance description 11Piston 11Port overview 27Port plate 11Product description 11

QQualifications

Personnel 7

Alphabetical index17


Alphabetical index

RRecommissioning

After standstill 35Related documents 4Removal 40

Performing 40Preparing 40

Repair 39Replacement 40Ring screw 14Runningin phase 35

SSafety instructions 6, 7Spare parts 39Storage 14Storage time 16Storing 15Stroke piston 11Suction port 19, 20

TTechnical data 46Tightening torques 29Tools 40Transport 14

With lifting device 15With ring screw 14

Transporting 14Transport protection 24Troubleshooting 43

uUnpacking 17Use

Improper 6Intended 6

wWarning 8Warranty 8, 16, 24, 32, 42Waste disposal 42Weights 14

Bosch Rexroth AGHydraulicsAxial piston unitsGlockeraustrasse 489275 Elchingen, GermanyTel. +49 (0) 73 08820Fax +49 (0) 73 087274info.brm[email protected]/axialpistonpumps

Printed in GermanyRE 9227001B/01.11

a18v(l)o replaces: 09.09 english series 10 - jo hydraulics · responsible contact person at...

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